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Short-Term Borrowings (Summary Of Short-Term Borrowings) (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Short-term Debt [Line Items]    
Short-term borrowings, Total Principal $ 333,909 $ 313,520
Federal Home Loan Bank Advances [Member]    
Short-term Debt [Line Items]    
Short-term borrowings, Total Principal $ 313,000 $ 293,800
Short-term borrowings, Weighted Average Rate 0.54% 0.45%
Securities Sold Under Agreements To Repurchase [Member]    
Short-term Debt [Line Items]    
Short-term borrowings, Total Principal $ 20,909 $ 19,720
Short-term borrowings, Weighted Average Rate 0.28% 0.27%